THESAURUS
Gulf
Charybdis, Maelstrom, abysm, abyss, aperture, arm, armlet, arroyo, back stream, backflow, backwash, backwater, bay, bayou, belt, bight, boca, box canyon, breach, break, broaching, canyon, cave, cavity, chap, chasm, check, chimney, chink, clearing, cleft, cleuch, clough, col, coulee, couloir, countercurrent, counterflow, counterflux, cove, crack, cranny, crater, creek, crevasse, crevice, cut, cwm, deep, defile, dell, depth, dig, diggings, dike, disclosure, ditch, donga, draw, eddy, estuary, euripus, excavation, fault, fenestra, fiord, firth, fissure, fistula, fjord, flaw, flume, fontanel, foramen, fracture, frith, furrow, gap, gape, gash, gat, gorge, groove, gulch, gully, gurge, gut, harbor, hiatus, hole, hollow, incision, inlet, interval, joint, kloof, kyle, lacuna, laying open, leak, loch, lough, maelstrom, mine, moat, mouth, narrow, narrow seas, narrows, natural harbor, notch, nullah, opening, opening up, orifice, outlet, pass, passage, passageway, pit, pore, quarry, ravine, reach, refluence, reflux, regurgitation, rent, rift, rime, road, roads, roadstead, rupture, scissure, seam, separation, shaft, slit, slot, slough, sound, space, split, stoma, strait, straits, swirl, throwing open, trench, twirl, uncorking, unstopping, valley, void, vortex, wadi, well, whirl, whirlpool, workings, yawn, yawning abyss
ROGET THESAURUS
Gulf
Interval
N
interval, interspace, separation, break, gap, opening, hole, chasm, hiatus, caesura, interruption, interregnum, interstice, lacuna, cleft, mesh, crevice, chink, rime, creek, cranny, crack, chap, slit, fissure, scissure, rift, flaw, breach, rent, gash, cut, leak, dike, ha-ha, gorge, defile, ravine, canon, crevasse, abyss, abysm, gulf, inlet, frith, strait, gully, pass, furrow, abra, barranca, barranco, clove, gulch, notch, yawning gulf, hiatus maxime, hiatus valde deflendus, parenthesis, void, incompleteness, period, interim (time), with an interval, far between, breachy, rimose, rimulose, at intervals, longo intervallo.
Depth
N
depth, deepness, profundity, depression, hollow, pit, shaft, well, crater, gulf, bowels of the earth, botttomless pit, hell, soundings, depth of water, water, draught, submersion, plummet, sound, probe, sounding rod, sounding line, lead, bathymetry, sonar, side-looking sonar, bathometer, deep, deep seated, profound, sunk, buried, submerged, subaqueous, submarine, subterranean, subterraneous, subterrene, underground, bottomless, soundless, fathomless, unfathomed, unfathomable, abysmal, deep as a well, bathycolpian, benthal, benthopelagic, downreaching, yawning, knee deep, ankle deep, beyond one's depth, out of one's depth, over head and ears, mark twine, mark twain.
Lake
N
gulf, lake, land covered with water, gulf, gulph, bay, inlet, bight, estuary, arm of the sea, bayou, fiord, armlet, frith, firth, ostiary, mouth, lagune, lagoon, indraught, cove, creek, natural harbor, roads, strait, narrows, Euripus, sound, belt, gut, kyles, continental slope, continental shelf, lake, loch, lough, mere, tarn, plash, broad, pond, pool, lin, puddle, slab, well, artesian well, standing water, dead water, sheet of water, fish pond, mill pond, ditch, dike, dyke, dam, reservoir, alberca, barachois, hog wallow, lacustrine,
gulf, lake, land covered with water, gulf, gulph, bay, inlet, bight, estuary, arm of the sea, bayou, fiord, armlet, frith, firth, ostiary, mouth, lagune, lagoon, indraught, cove, creek, natural harbor, roads, strait, narrows, Euripus, sound, belt, gut, kyles, continental slope, continental shelf, lake, loch, lough, mere, tarn, plash, broad, pond, pool, lin, puddle, slab, well, artesian well, standing water, dead water, sheet of water, fish pond, mill pond, ditch, dike, dyke, dam, reservoir, alberca, barachois, hog wallow, lacustrine.